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Postgrey

Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert.

Cost / License

  • Free
  • Open Source

Platforms

  • Linux
  • Self-Hosted
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  • Nicolas HA added Postgrey as alternative to Klar

Postgrey information

Postgrey was added to AlternativeTo by shiki on and this page was last updated .

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What is Postgrey?

Postgrey is a Postfix policy server implementing greylisting developed by David Schweikert.

When a request for delivery of a mail is received by Postfix via SMTP, the triplet CLIENT_IP / SENDER / RECIPIENT is built. If it is the first time that this triplet is seen, or if the triplet was first seen, less than 5 minutes ago, then the mail gets rejected with a temporary error. Hopefully spammers or viruses will not try again later, as it is however required per RFC.